fix(module:select): fix select zero value & scroll bug

[vthinkxie]

close #1229 close #1245

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Application (the showcase website) / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[codecov]

Codecov Report

Merging #1299 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1299      +/-   ##
==========================================
- Coverage   97.26%   97.25%   -0.02%     
==========================================
  Files         191      191              
  Lines        7926     7929       +3     
  Branches     1041     1041              
==========================================
+ Hits         7709     7711       +2     
  Misses         25       25              
- Partials      192      193       +1

Impacted Files	Coverage Δ
components/select/nz-option-li.component.ts	100% <100%> (ø)	⬆️
...mponents/select/nz-select-top-control.component.ts	97.72% <100%> (+0.02%)	⬆️
components/select/nz-option-container.component.ts	91.87% <100%> (+0.05%)	⬆️
components/table/nz-table.component.ts	94.19% <0%> (-0.65%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c3b9c39...2e1bf69. Read the comment docs.